Terribly eager to tally (5)

I believe the answer is:

agree

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'to tally' is the definition.
(I know that agree is a more specific form of agree)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for agree that I've seen before include "Say yes to a suggestion" , "Hold the same view" , "Square" , "Eager (anag)" , "Enjoy view in common" .)

I've seen this clue in The Mirror.

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